After tomorrow, it will be spring.
Après: preposition, after …, equivalent to English after.
Des Moines: The noun of time, tomorrow, is equivalent to the English word tomorrow.
C'est: main line structure, indicating judgment, ... is ..., which is equivalent to English it is…… ... ...
Le: masculine singular definite article, equivalent to English.
Paris Spring department store: time nouns, spring, spring, equivalent to English spring.